The unit of length convenient on the atomic scale is known as an angstrom and isdenoted by Å: 1 Å = 10–10 m. The size of a hydrogen atom is about 0.5 Å. What is thetotal atomic volume in m 3 of a mole of hydrogen atoms ? from Physics Units and Measurement Class 11 Manipur Board
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The unit of length convenient on the atomic scale is known as an angstrom and is
denoted by Å: 1 Å = 10–10 m. The size of a hydrogen atom is about 0.5 Å. What is the
total atomic volume in m 3 of a mole of hydrogen atoms ?

Radius of hydrogen atom, r = 0.5 = 0.5 × 10–10 m

Volume space of space hydrogena space atom space equals space 4 over 3 πr cubed space

equals 4 over 3 cross times 22 over 7 cross times left parenthesis 0.5 cross times 10 to the power of negative 10 end exponent right parenthesis cubed space equals space 0.524 space cross times space 10 to the power of negative 30 end exponent space straight m cubed space

1 space mole space of space hydrogen space equals space 6.023 space cross times space 10 to the power of 23 space atoms space of space hydrogen

therefore space Volume space of space 1 space mole space of space hydrogen space atom

space equals space space 6.023 space cross times space 10 to the power of 23 space cross times 0.524 space cross times 10 to the power of negative 30 end exponent

equals space 3.16 space cross times space 10 to the power of negative 7 end exponent space straight m cubed

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Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.
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What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory. 
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What is measurement?

Measurement is the process of attaching a numeric value to an aspect of a natural phenomenon. Measurement is making the quantitative knowledge of a physical quantity. 
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Define unit.

The quantity used as a standard of measurement is called unit. 

Example: Unit of time is second. 

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Define physical quantity.

 


A measurable quantity in terms of which laws of Physics can be expressed is called physical quantity.

The result of a measurement of a physical quantity is expressed by a number accompanied by a unit.


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